When your girlfriend or boyfriend (whatever preference may be) walks by while reaching out to bump your crotch with their hand. Not to be confused with a grope, it's just a quick tap, to let you know they're thinking of the guy downstairs.
We were just cleaning house and all of a sudden she walked past me and gave me a junk bump... then it was time to clean naked!
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When a girl intentionally bumps up against a guy's junk either to check out his package or see if she can get a rise. Supposed to seem accidental or not be noticed at all like she did so unintentionally.
After she "junk bumped" him, she discovered right away that he found her attractive.
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2. when a woman looks like she has meaty man bits in her pants.
i saw junk bump in her camo pants...
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When two people of the opposite sex accidentally bump into each other in a sexual type of way.
" hey James, I just bumped junk with Ashley last period to try to flirt with her, I think it worked."
" Ya right, you wished it would."